Improvement in
saw-gttmmer



.stent @Mira A identit gisten Letters Patent No. 96,008, dated October 19,1869,

IMPROVEMENT IN SAW-GUMMER.

c l The Schedule referred to in these Letters Patent and making part of the same,

Po all who-m -it may concern:

Be it known that 'I, NELSON Jonsson, of Jasper,-

in the county of Steuben, and in the State of New York, have invented certain new and useful Improvements in Saw-Gumming Machines; and I do hereby declare that the following is afull, clear, and exact description thereof, reference being had to the accompanying drawings, and to the` letters of reference marked thereon, making a.part of this specification. v

The nature of my invention consists in adding certain devices as an improvement on what is commonly known as the Emerson gummer, and those of similar make, so as to securely hold the saw, and prevent all movement while it is being gummed.

Figure l isa side elevation of my invention. Figures?. and 3 are 'views of the dogs attached to the chain, so as to assist in holding the saw.

Letter A represents one of Emersous ordinary guml mers, to which a saw-blade is attached. As in the ordinary gummers, the saw-blade is held only by two set-screws B, there is a constantrocking motion of the saw, which greatly interferes with t4 e operation, and requires an amount of force to be expended onthe screw that the gumlner either becomes greatly strained or is broken 'iu\t\vo. In order to relieve the screw of this great pressure, I employ two devices.

Upon the two set-screws B, I slip two elongated metal plates'C, one on each side of the saw.

At each end of these plates or bars there is a smaller set-screw, D, which is brought to bear against the sides of the'saw, thus having it held in three places instead of one, and prevents any rocking or other motion. f

In casting the gunnners, these plates or bars will be cast on the main block, and may extend either up above or down below only, as may be desired.

' In order torelieve the 'set-screws as much as possible, upon two hooks or projections cast on the gummer, I attach the chain E, which passes over the saw, and assists in not only steadying the saw, but in pressf ing it up against the cutter. This chain canbe of any length, and can be shortened or lengthened, so as to adapt it to both large and small` saws, by changing the links on the hooks. l

As the chain by itself` would scarcely be sufficient to 'grasp the saw securely enough, I propose to employ two kind of dogs. l

The one, G, consists of a mfetal block, grooved upon both its top and bottom, and has a loop upon both ends, so as to hold it on the chain. The groove uponits bottom enables it to. take abetter hold of the saw, while the one on top serves as 'a bed, in which the chain rests.

Th'e other dog H is formed like a hinge, and when the chain is pressed over it, it closes, so as to grasp it tightly and firmly. Upon the inner edges of the sides' of this dog there are two rough file-like projections, and upon the ends of the rod,`which binds the two parts together, there are sharp chisel-like edges, which prevent the saw from sliding or slipping.

Having thus described my invention,

What I claim, and desire to secure by Letters Pat ent, is-

l. The chain E, when used'wth the dogs, for the purpose of holding the 'saw against the cut-ter, substantially as set forth and described.

2. The dog G, consisting of a grooved metal block, provided with loops, substantially as specified.

3. The dog H, when formed like a' hinge, with its rough and sharp projections, so as to prevent the saw from slipping, substantially as described.

4. The arrangement, upon the inner upper ends oi' the slotted frame A, of the two flat plates O O, placed at right angles with the frame, and providedwith the central screw B and end screws D D, substantially as shown and described.

In testimony that I claimv the foregoing, I have hereunto set my hand, this 17th day of April, 1869.

NELSON JOHNSON.

XVitnesses:

J. M. SIMPSON, L. CRAIG. 

